METHOD OF MANUFACTURING POLYACRYLONITRILE THREADS AND BRAIDS SUITABLE FOR FABRICATION OF HIGH-STRENGTH CARBON FIBERS Russian patent published in 1998 - IPC

FIELD: synthetic fibers. SUBSTANCE: invention, in particular, relates to production of structurally uniform fibers with microfibrillar structure across entire fiber cross-section, which are further used to manufacture, via known technology, carbon fibers and braids with strength above 5.0 Gpa. Polyacrylonitrile fibers are extruded from homogeneous spinning solutions containing 10000-50000 0.1-0.5-mcm disperse particles in 1 qu.cm at concentration of precipitator in coagulation basin 2-12% above its threshold precipitation concentration. Disperse particles are introduced into reaction mixture before polymerization or into spinning solution. Fiber strength is 5.0-5.36 Gpa and elongation 1.6-1.8%. EFFECT: improved consumer quality. 4 cl, 2 tbl, 3 ex